I have two pekes thomas age 12 who sometimes wonders around in his own little world and sits with his head resting on my radiator, barks at nothing but he seems happy enough,  and mae ling who is also 12 and is on heat i thought at her age this would have finished.  Thomas is not interested in her any more, poor girl.....

Bitches don't generally have a menopause I'm afraid. I wouldn't leave the two of them unsupervised - you never know that Thomas won't suddenly rediscover his youth, and the consequences could be fatal.
:)